Rotational symmetry simply means the property of an object to look the same (replicating its original shape after being rotated.
The number of times a graph can be rotated around a circle and still maintains its original shape is called its order of rotational symmetry.
Carefully observing the graph A, we can see it has two orders of rotational symmetry. That is, there are two different distinct positions whereby the original shape is maintained.
Graph B on the other hand has 0 order of rotationalsymmetry , hence does not show rotationalsymmetry.
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